Nanotube transistors as direct probes of the trap dynamics at dielectric-organic interfaces of interest in organic electronics and solar cells.
The high sensitivity of nanotube transistors is used for the first time as a probe to study charge dynamics at a dielectric/polymer (polythiophene) interface, an inorganic/organic junction of particular importance for organic solar cells, and organic field effect transistors (OFETs). A carbon nanotube field effect transistor is coated with a thin film of a photoconductive polymer and photoexcited so as to generate carriers in the structure. Comparison between devices using SiO2 and TiO2 as gate dielectric reveals the critical role of the dielectric and clearly elucidates the relative contributions of the polymer and the dielectric layers on the separation, trapping, and relaxation of photogenerated charges.
Anghel
Costin
C
Laboratoire d'Electronique Moleculaire, Service de Physique de L'Etat Condense (CNRS URA 2464), CEA, IRAMIS, F-91191 Gif-sur-Yvette, France.
Derycke
Vincent
V
Filoramo
Arianna
A
Lenfant
Stéphane
S
Giffard
Benoit
B
Vuillaume
Dominique
D
Bourgoin
Jean-Philippe
JP